Backlight control method, drive circuit for display panel, and display device

Abstract

This application discloses a backlight control method, a drive circuit for a display panel, and a display device. The backlight control method includes steps of: turning on a power supply; and generating an enable signal when detecting whether image data is received, and generating and outputting a first enable signal to control a backlight to turn on if any image data is received, or generating and outputting a second enable signal to control the backlight to turn off if no image data is received.

What is claimed is: 
     
         1 . A backlight control method, wherein the backlight control method comprises steps of:
 A: turning on a power supply; and   B: detecting whether image data is received; controlling a backlight to turn on if any image data is received, or, controlling the backlight to turn off if no image data is received; wherein   Step B comprises the following steps:
 B 1 : generating an enable signal when detecting whether image data is received, and generating and outputting a first enable signal when it is detected that no image data is received, or generating and outputting a second enable signal when it is detected that any image data is received; and 
 B 2 : receiving and recognizing, by a backlight control circuit of a display panel, the enable signal, and controlling the backlight to turn off if the enable signal is the first enable signal, or controlling the backlight to turn on if the enable signal is the second enable signal. 
   
     
     
         2 . The backlight control method according to  claim 1 , wherein in the step of turning on the power supply, the step of controlling the backlight to turn on is performed simultaneously when turning on the power supply. 
     
     
         3 . The backlight control method according to  claim 1 , wherein, after step A, the method further comprises a step of
 M: detecting whether an aging mode is started, and performing step B and disconnecting an enable signal pin if the aging mode is started, or performing step B directly if the aging mode is not started; wherein   Correspondingly, in step B 1 : when it is detected that no image data is received, the following step is performed simultaneously when outputting the first enable signal: exercising control to output a preset image for displaying,   Correspondingly, in step B 2 : the backlight control circuit of the display panel receives and recognizes the enable signal, and controls the backlight to turn off if the enable signal is the first enable signal, or controls the backlight to turn on if the enable signal is the second enable signal or no enable signal is recognized.   
     
     
         4 . The backlight control method according to  claim 1 , wherein, after step A, the method further comprises a step of:
 M: detecting whether an aging mode is started, and directly generating and outputting the second enable signal and skipping step B if the aging mode is started, or performing step B if the aging mode is not started, wherein   in step B 1  : when it is detected that no image data is received, the following step is performed simultaneously when outputting the first enable signal: exercising control to output a preset image for displaying; and   in step B 2 : the backlight control circuit of the display panel receives and recognizes the enable signal, and controls the backlight to turn off if the enable signal is the first enable signal, or controls the backlight to turn on if the enable signal is the second enable signal or if no enable signal is recognized.   
     
     
         5 . The backlight control method according to claim , wherein, before step B 1 , the method further comprises a step of:
 B 0  counting a turn-on duration of the power supply; when the turn-on duration is within a preset first tune period, outputting the second enable signal to the backlight control circuit to keep the backlight on; and, when the turn-on duration exceeds the preset first time period, performing step B 1 .   
     
     
         6 . The backlight control method according to  claim 5 , wherein, after step A, the method further comprises a step of:
 M: detecting whether an aging mode is started, and performing step B and disconnecting an enable signal pin if the aging mode is started, or performing step B directly if the aging mode is not started; wherein   in step B 1 : when it is detected that no image data is received, the following step is performed simultaneously when outputting the first enable signal: exercising control to output a preset image for displaying; and   in step B 2 : the backlight control circuit of the display panel receives and recognizes the enable signal, and controls the backlight to turn off if the enable signal is the first enable signal, or controls the backlight to turn on if the enable signal is the second enable signal or if the enable signal is interrupted, and a time point of displaying the preset image is later than the first time period.   
     
     
         7 . The backlight control method according to  claim 6 , wherein a length of the first time period is set to a length of one frame. 
     
     
         8 . The backlight control method according to  claim 1 , wherein a time point of turning off the backlight is earlier than a time point of starting the aging mode. 
     
     
         9 . The backlight control method according to  claim 1 , wherein, after step A, the method further comprises a step of:
 M: detecting whether an aging mode is started, and setting, by the timing control circuit if the aging mode is started, a switch signal of a switch signal pin to be a low-level signal, and directly generating and outputting the second enable signal, and skipping step B, or setting, by the timing control circuit if the aging mode is not started, a switch signal of a switch signal pin to be a high-level signal, and performing step B.   
     
     
         10 . The backlight control method according to  claim 1 , wherein, after step A, the method further comprises a step of: keeping the backlight always on, and directly entering an aging mode. 
     
     
         11 . The backlight control method according to  claim 3 , wherein, when the aging mode needs to be started, the timing control circuit sets a switch signal of a switch signal pin to be a high-level signal, and directly generates and outputs the second enable signal to keep the backlight always on. 
     
     
         12 . A drive circuit for a display panel, wherein the drive circuit comprises:
 a timing control circuit; and   a backlight control circuit, configured to control a backlight to turn off or turn on; wherein   the timing control circuit detects whether image data is received, and controls the backlight control circuit to turn on the backlight if the timing control circuit has received any image data, or controls the backlight control circuit to turn off the backlight if the timing control circuit receives no image data.   
     
     
         13 . The drive circuit for a display panel according to  claim 12 , wherein an enable signal pin is disposed on the timing control circuit, and the backlight control circuit is connected to the enable signal pin;
 the timing control circuit generates an enable signal when detecting whether image data is received; and, when the timing control circuit detects that no image data is received, generates a first enable signal and outputs the first enable signal to the enable signal pin, or, when the timing control circuit detects that any image data is received, generates a second enable signal and outputs the second enable signal to the enable signal pin; and   correspondingly, the backlight control circuit receives and recognizes the enable signal, and controls the backlight to turn off if the enable signal is the first enable signal, or controls the backlight to turn on if the enable signal is the second enable signal.   
     
     
         14 . The drive circuit for a display panel according to  claim 12 , wherein the timing control circuit comprises:
 an aging mode control circuit, configured to control whether to enter an aging mode;   an image data detection circuit, configured to detect whether image data is received, and coupled to the aging mode control circuit;   an enable signal generation circuit, configured to generate an enable signal, and coupled to the image data detection circuit; and   an enable signal pin, configured to receive the enable signal generated by the enable signal generation circuit and send the enable signal to the backlight control circuit; wherein   the aging mode control circuit detects whether the aging mode is started, and, if the aging mode is started, disconnects the enable signal pin of the enable signal generation circuit, and exercises control to output a preset test image for displaying; and   the image data detection circuit outputs a first enable signal to the enable signal pin when it is detected that no image data is received, and outputs a second enable signal to the enable signal pin when it is detected that any image data is received.   
     
     
         15 . The drive circuit for a display panel according to  claim 14 , wherein the backlight control circuit comprises:
 a receiving pin, connected to the enable signal pin;   a switch circuit, configured to control the backlight to turn on or off; and   a determining circuit, connected to the receiving pin, and configured to control connection to the switch circuit; wherein   the determining circuit receives and recognizes the enable signal of the receiving pin, and controls the switch circuit to turn off the backlight if the enable signal is the first enable signal, or controls the switch circuit to turn on the backlight if the enable signal is the second enable signal or if the enable signal is interrupted.   
     
     
         16 . A display device, comprising a display panel and a drive circuit, wherein the drive circuit drives the display panel, and the drive circuit comprises:
 a timing control circuit, configured to receive image data, and drive the display panel to display an image; and   a backlight control circuit, configured to control a backlight to turn on or turn off wherein   the timing control circuit controls, by transmitting an enable signal to the backlight control circuit, the backlight to turn on or turn off.   
     
     
         17 . The display device according to  claim 16 , wherein the timing control circuit comprises:
 an aging mode control circuit, configured to control whether to enter an aging mode;   an image data detection circuit, configured to detect whether image data is received, and coupled to the aging mode control circuit;   an enable signal generation circuit, configured to generate an enable signal, and coupled to the image data detection circuit; and   an enable signal pin, configured to receive the enable signal generated by the enable signal generation circuit and send the enable signal to the backlight control circuit; wherein   the aging mode control circuit detects whether the aging mode is started, and, if the aging mode is started, disconnects the enable signal pin of the enable signal generation circuit, and exercises control to output a preset test image for displaying; and   the image data detection circuit outputs a first enable signal to the enable signal pin when it is detected that no image data is received, and outputs a second enable signal to the enable signal pin when it is detected that any image data is received; and   the backlight control circuit comprises:   a receiving pin, connected to the enable signal pin;   a switch circuit, configured to control the backlight to turn on or off; and   a determining circuit, connected to the receiving pin, and configured to control connection to the switch circuit; wherein   the determining circuit receives and recognizes the enable signal of the receiving pin, and controls the switch circuit to turn off the backlight if the enable signal is the first enable signal, or controls the switch circuit to turn on the backlight if the enable signal is the second enable signal or if the enable signal is interrupted.